Question

GTP bound tubulin molecules pack efficiently together in the wall of the microtubule. _______ bound tubulin molecules bind less strongly to each other.

1) GDP
2) ATP
3) ADP
4) AMP

Answer 1

The correct answer is GDP. GTP bound tubulin molecules pack efficiently together in the wall of the microtubule, while GDP bound tubulin molecules bind less strongly to each other.

Step-by-step explanation:

The correct answer is 1) GDP.

GTP-bound tubulin molecules pack efficiently together in the wall of the microtubule. In contrast, GDP-bound tubulin molecules bind less strongly to each other. GTP-bound tubulin molecules have a higher affinity for each other, allowing them to form stable microtubule structures.

When GTP is hydrolyzed to GDP within the microtubule, the binding strength decreases, leading to potential destabilization of the microtubule structure.